基于spring的异常处理_基于spring的异常体系处理

1，ResponseVo包装类

package com.zhiyou100.demo.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**包装类，将数据包装成json格式返回给前端
 * @author zhangfan
 * @date 2019/10/9
 */
@Data   //生成toString和get&&set
@NoArgsConstructor  //生成无参构造方法
@AllArgsConstructor //生成所有有参构造方法
public class ResponseVo<T> {

    private Integer code;

    private String message;

    private T data;
}

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2，自定义异常类

package com.zhiyou100.demo.exception;

/**定义异常处理类
 * 1.继承RuntimeException
 * 2.定义属性code，返回错误码
 * 3.写get方法
 * 4.写入有参构造方法
 * 5.message用来输出异常信息
 * @author zhangfan
 * @date 2019/10/9
 */
public class MyException extends RuntimeException{

    private Integer code;

    public MyException(Integer code,String message){
        super(message);
        this.code = code;
    }

    public Integer getCode() {
        return code;
    }
}

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3，Controller层

package com.zhiyou100.demo.controller;

import com.zhiyou100.demo.exception.MyException;
import com.zhiyou100.demo.vo.ResponseVo;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**Controller层的异常处理
 * 1.@RestControllerAdvice注解说明是异常处理
 * 2.定义方法返回值为ResponseVo
 * 3.@ExceptionHandler(MyException.class)注解绑定我的异常类
 * @author zhangfan
 * @date 2019/10/9
 */
@RestControllerAdvice
public class ExceptionController {

    @ExceptionHandler(MyException.class)    //绑定异常类
    public ResponseVo handlerMyException(MyException ex){

        return new ResponseVo(ex.getCode(),ex.getMessage(),null);

    }
}

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异常的使用比如登录时

/**
     * 管理员登录
     * @param account   账号
     * @param password  密码
     * @return
     */
    @Override
    public Admin findAdminAccountAndPassword(String account, String password) {

        Admin findAccountAdmin = adminDao.findAccount(account);

        if (findAccountAdmin == null){
            throw new MyException(403001,"账号不存在");
        }

        Admin findAccountAndPasswordAdmin = adminDao.findAccountAndPassword(account,password);

        if (findAccountAndPasswordAdmin == null){
            throw new MyException(403002,"密码不正确");
        }
        return findAccountAndPasswordAdmin;
    }
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